Store has decided to implement a Point of Sales System, which able to calculate the monthly Good and Service Tax (GST) payable to the Customs. According to the Royal Malaysian Customs General Guide, taxable consumer products can be divided into 2 categories; Standard-rated or zero-rated. Standard-rated products are subject to a positive tax rate of 6% whereas zero-rated products are subject to a tax rate of 0%. There are two types of users for the system; supervisor and cashier. Supervisor has the full access to the system, whereas the cashier only has the ability to access the checkout function.